1. (i) What is the structure of the atom as proposed by Rutherford?

(ii) Distinguish between the atomic number and the mass number of an element.
(iii) Explain briefly why the relative atomic mass of chlorine is not a whole number.

2(i) What is meant by first ionization energy?
(ii) List three properties of electrovalent compounds

(iii) Consider the following pairs of elements:
9F and 17CL;
12Mg and 20Ca.
Explain briefly why the elements in each pair have similar chemical properties.

3.Explain briefly the following terms using an appropriate example in each case
homologous series;
heterolytic fission.